Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324l..29h&link_type=abstract
Astronomy and Astrophysics, v.324, p.L29-L32
Astronomy and Astrophysics
Astrophysics
17
Supernovae: General, Supernovae: Individual: Sn1997Ab
Scientific paper
We report the discovery of SN1997ab, a supernova with a Seyfert 1 type spectrum similar to SN1987F. SN1997ab was first seen at B=14.7+/-0.5 on a digitized objective prism spectrum taken on April 11, 1996 for the Hamburg Quasar Survey with the Calar Alto 80cm Schmidt telescope and was automatically selected as a low redshift QSO candidate. Spectra and images taken with CAFOS at the 2.2m telescope on Calar Alto on Feb. 28 and March 2, 1997 show the SN at B=16.2 with strong Balmer lines, broad FeII emission bumps at {last_=5250Å and 4580Å, a strong IR CaII triplet and the HeI 7065Å and 5876Å lines. The SN is located 3."7 southwest off the center of the faint (B=~17.7) dwarf irregular HS0948+2018. According to sharp HII region type [OIII], [NII], [SII] lines and sharp Balmer line components, the radial velocity of the parent galaxy is 3750km/s. This yields a brightness on April 11, 1996 of M_B_=-19.1 (for H_0_=65km/s/Mpc) and of M_B_=-17.6 on March 2, 1997. With its high luminosity and slow fading SN1997ab is similar to SN1988Z and SN1987F. SN1997ab can be expected to be observable for several years.
Engels Dieter
Hagen Hans-Juergen
Reimers Dieter
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